Question about coil packs

[FishinDave]

I have found a ton of coil packs that are for the same year same horsepower as I have but the last numbers on the coils are different. The numbers on my coils are 582508 23DN OA and 582508 28DN OA.The numbers on the coils I have found for replacement are the same 582508 but the last numbers and letters are different. Is there as significance in last part numbers/letters. Thanks in advance

 

[racerone]

Re: Question about coil packs

These coils are very reliable.--Why are you shopping for replacements ?---There is no significance to those numbers for the consumer.

 

[FishinDave]

Re: Question about coil packs

Bottom cylinder was not firing and top cylinder was. Swapped coils and the bottom one was firing and the top one was not. I agree that these coils are very reliable and these are probably 30 years old. One of them is still good. Thanks for your help.